Nidhogg

Nidhogg is a fast-paced two-player dueling game where two players sword fight in a side-scrolling environment. Players can run, jump, slide, throw their swords, and fistfight. The player-character's sword can be held at three different heights: low, medium, and high. The player continually pushes towards one side of the screen, such that they are permitted a few seconds to run towards their opponent's side while their opponent respawns after dying. (wikipedia.org).